NORTH AMERICAN COLi:OPTERA. 
301 
for one species to have to another. The males are abundantly dis- 
tinct by the ventral charactei’s, but both sexes can be separated from 
vittatocollis by the hairy jdeuras and coxal plates. 
Hab. — Texas. 
A. biliiiesitii!^ Weber. — Black, with sometimes a slightly greenish tinge, 
opaque; sides of thorax clothed with yellow pubescence, and a vitta of same 
from the humeri three-fourths to the tip of the elytra. Antennae slightly aene- 
ous, extending beyond the middle of the thorax, serrate from the fourth joint; 
front slightly convex, densely coarsely punctured, occiput impressed, the line 
extending to the middle of the front. Thorax one-third wider than long, dis- 
tinctly narrower at base, sides nearly straight anteriorly, sinuate near the hind 
angles, which are sharply rectangular and not carinate, margin sinuous; disc 
convex, a very vague median depression, the lateral oblique impression short; 
surface rather finely transver-sely strigoso-punctate, the sides broadly clothed 
with golden, rarely whitish pubescence ; scutellum transversely carinate; elytra 
sinuate behind the humeri, broadened behind the middle, apices rounded, serru- 
late ; di.sc flattened, the basal depressions moderate, sutural edge slightly elevated 
at apical third, surface densely granulate and subopaque, with a vitta of yellow 
or whitish hairs extending from the basal depression three-fourths to apex ; body 
beneath more shining than above and more greenish ; prosternal lobe truncate, 
intercoxal process rather broad, gradually narrowed to apex, propleurse granulate, 
sparsely pubescent ; meso- and metapleur® and outerside of coxal plates rather 
densely pubescent. Abdomen finely and sparsely punctate along the middle and 
more densely and coarsely at the sides, the first segment rougher and strigose, 
the vertical portions of the segments densely pubescent; pygidium coarsely 
punctate, with a strong median carina, which projects at apex ; claws dissimilar 
in the sexes. Length . 22 — .37 inch. ; 5.5 — 9.5 mm. 
Male. — Head more or less green, more densely punctate and opaque. 
Prosternum densely punctate and subopaque, esjtecially between the 
coxte, not pubescent. First ventral segment slightly flattened at 
middle, the second with a deep smooth groove ; anterior tibite slightlv 
mucronate at apex, the others sinq)le ; anterior and middle claws 
almost truly bifid, the posterior claws with a slender, acute tooth. 
Female. — Head more convex, less densely punctured, more shining, 
with lirassy or cuj)reous lustre. Prosternum more shining, less densely 
punctured. Ventral segments simple; tibiie not mucronate ; claws 
with a slender acute tooth on all the feet. 
Variations. — The hair forming the lateral space of the thorax and 
the vittie on the elytra is usually golden-yellow in color, but speci- 
mens often occur with hair quite white with intermediate shades. 
jNIore rarely specimens occur without any pubescent markings above, 
the absence of hair not being due to abrasion, as might be suspected, 
but seems to be the result of starved development, as all the speci- 
mens seen are of the smallest size. 
